Description of problem: Tried using the qemu-img binary to create a snapshot of qcow2 image when VM is not running, but fails to create snapshot. #qemu-img info test_8G.qcow2 image: test_8G.qcow2 file format: qcow2 virtual size: 8.0G (8589934592 bytes) disk size: 2.5G cluster_size: 4096 Version-Release number of selected component (if applicable): RHEL Version:Red Hat Enterprise Linux Server release 5.4 (Tikanga) KVM Version:kvm-83-105.el5 qemu-img binary version: 0.9.1 QEMU PC emulator version: 0.9.1 (kvm-83-maint-snapshot-20090205) How reproducible: #qemu-img snapshot -c testsnap test_8G.qcow2 qemu-img binary process is running for long time(> 10 min) and is not creating a snapshot. # qemu-img snapshot -l test_8G.qcow2 # Steps to Reproduce: 1. create a qcow2 image and install a VM on that. 2. using qemu-img snapshot -c; try to create a snapshot of the VM 3. Above with fail to create with out throwing any Error. Actual results: There is no snapshot of the VM created. Expected results: Expected to have a snapshot of the VM created Additional info:
Please use external snapshots instead, i.e. create a new image that references test_8G.qcow2 as its backing file and use this image to run your VM: qemu-img create -f qcow2 -b test_8G.qcow2 -F qcow2 test_8G_cow.qcow2